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一、起因在冀北的坝上地区及时准确的掌握春小麦麦杆蝇成虫的发生时期,除检查越冬幼虫化蛹进度,计算成虫出现时期外,更主要的还是利用捕虫网扫捕成虫。可是因坝上风多、风大,直接影响到用捕虫网的捕虫效果。从捕蝇实践中得知,在空气流速≤0.3m/s 时,用捕虫网捕蝇,扫网进度应为1.9～2.3m/s,网兜才能正常张开。而顺风风速在4m/s 左右时,捕虫网左右摆动顺风向网兜开张受阻;风速在6m/s 左右时,左右摆动捕虫网,顺风向时网
First, the cause of the Hebei region of Bashang in a timely and accurate grasp of spring wheat stem fly adult period, in addition to check overwintering larvae pupa progress, calculate the occurrence of adult worms, the more important is the use of insect net sweep trapping adults. However, due to the dam on the wind, the wind, a direct impact on insect catching insects net effect. From the flytrap practice learned that the air flow rate ≤ 0.3m / s, with insect net catching fly, sweeping progress should be 1.9 ~ 2.3m / s, net bag to open normally. When the downwind wind speed is about 4m / s, the insect net swings downwind to the net pocket to be blocked; when the wind speed is about 6m / s, the insect net swings left and right,